Back up important files (documents, photos, downloads, product keys)
Unplug external drives and accessories (except keyboard/mouse if needed)
Open Settings
Select System
Select Recovery
Under Reset this PC, select Get started
Choose one option:
Keep my files
Remove everything
Select Cloud download or Local reinstall (if available)
Review the settings shown on screen
Select Next
Select Reset
Follow any on-screen prompts
Restart and complete initial setup (region, keyboard, sign-in)
Reinstall apps and restore backed-up files